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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd61c510ed5dd38614abcb1792aff75fa0cfad048d8e79315b2007a36b4be921' 
  AND token = 'wZZAeMoJLQk9l8P/jeF2yYuK8CfV2oGMGYcOqftx7ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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