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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15f974e5a429fb7ceb61eb49802248ed7fc5f091a73b11fce2f4f94058453c3' 
  AND token = 'GTGDbNblv5grr1l0PwOP48iAJLe7UMr/y7Dmp4hg5Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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