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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf40ce6749ed1a5c99ef97a8831e59e9474befbfc54ccc3ab90363a0b7d1be2' 
  AND token = 'iw8BmxgVCmcj46/Y0yqvlMWbcSGWZuqa14A+SbE2e2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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