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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2087af6f94ef42bc9fca7897205ffb800a0ed78770c5223c507b959d081c79b3' 
  AND token = 'pG/SrfR75DYvXQt2uV7iEWH2ZWR7NKVr9S6KagSj/BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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