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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e57026c3181fc3935a3ac0e867603f4b1c94e84a7378a31713a5ec38406320' 
  AND token = 'lIf8S5eOu8XGkaAMNmv27NZdA5R5vGMNrTzpUi/tB3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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