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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de84a02f4359d27542bbfc5456a026f4d03907e0ec8e2c82304118eb16650e02' 
  AND token = 'Gyum0GWQ1nykkDMCtESCJEW54sld42OO7S0sfj9iApQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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