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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c28afa90e61b25d60430b707825e217c92dc011a7088449caee97d034838c16' 
  AND token = 'kABS3JGquiatC3V6gE38UsKNWQ5Bb4oaOcDMFsV3hMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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