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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c237792de6add8fbdd107c5282441f7c3d80a935fa99eaaafacf854b6858135' 
  AND token = 'qKTSWy8OdtnhzWOVpuxGjde8TXiJ2CZCmiido7jhIZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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