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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7175c1995e3a6d15c644c2e186b574ab1b26c5efb2deb96e84be78fe802f5d' 
  AND token = 'lsG7E12IzZnDPwxCgSr/lC6TlARop7GrVmpAw6b1XnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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