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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f250c5f8bdecf67cfff39158929d9b3189a306ae45b91efdac750d5095c47ea' 
  AND token = 'RIKwm5GubwHGtLWzPYlPNMl931jaeG3ch3wr/TnYxIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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