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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e604a8ae35e31a2f5f03f1ef52d8bdfae74125ecb963b9edae5f28b642a27e94' 
  AND token = 'UWcPEbA8ynWUSY7a/Bv2XfO0Jah/PSdZJEl/NIMTqH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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