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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0fd5cbc601994d7bf09b26b068985477e18e0295ab7451b343b564d14c293f' 
  AND token = 'KegRb2/bMsfzvOCuqURkaKxBcPkukv5riTM56ix+l+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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