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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f8846e6ec81c3c3a1290ab000e66021c9d2fbe2da0b1fefa477a84295f65a0' 
  AND token = 'Zhb2xuMTBqH8kOAsf32XEkAw4lHA4dUeq1ATq1Qx+es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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