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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f39b93ea00fd487c34214286b42e3ae9e60f8d06a156ad78f304b937db504a' 
  AND token = 'TSP0raT+wM5xzRCMDq5EFTSvFoyJVOnA+lo5PW3be88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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