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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be7f1bf043b4ffa644ab58de08cd42470fe08e841629a40f3990484b1300e2c' 
  AND token = 'bb6VUR64+4WlPYf6grJCqIkDC21M9y2/L1fevLcxKP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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