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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab154868c7a9547748a1a452ed6f5349d5496b873bad2c2c7f5e0ede8baa48e' 
  AND token = 'VupkEj69Yt9eR18Jy4ebMGo4OA0cAcsqigxFcF0IQeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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