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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa013a013c103c6e8dea4af86c9d91293edf57b493392f0538a75b62b577b83' 
  AND token = 'A+bRKlRiQTU/3tnd/g5LHjVhcs5pwp57i0CrOsP3tqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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