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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7609cb4847c9f391d955bce7c0f8244d384f46ad03cb36d84bc8f37304510629' 
  AND token = 'TUKvXr2UKs1A/GG42yXUwQ6FPfnRLPA+xwzA8fep0rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}