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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6c8a3ab16f67079744071bfacfd93bb38522ddb4297d6ad42a35a73ca49066' 
  AND token = '3e6fkGwKFZ+KQNueQSNmKXQ8LR3j+Det4Olb/11m5FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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