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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96c7a3ab5d9bd4d6dcc27427d03bd64149ee45905dda779be29722375cafe5d' 
  AND token = 'AZJfffZ02x0i47voI4v1n8tH3oAg6nxWPD35AEDEW9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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