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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fc54bd1f6b890d79441fa6b4e4ac0d709f85044eed29d6bd59c16d6d737409' 
  AND token = 'gBYQpa+mthvXosg0oEPKhkqWoZp5s6OICmvrHEdSQ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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