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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c90717e670652e7190f16652fb6732632cea92d2c364f66a6f3db18dde481cb' 
  AND token = 'Hwe6O4FBQ4zpt/PNBNwk1ye0AwNBlh+XAvNJMoPFrHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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