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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef98a0daf0e0347828f899f98bd1a17bd395505533fcfd768fedcb4887cefb53' 
  AND token = '+52SbuJcggAIgfAAmYzoz5NpahLQqV7wY6l3ugT8Cvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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