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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36050dc55bc89c5dc7a3b17b9ea698892dce4ae9a3046d36bf4c3da4cc7d4d80' 
  AND token = '91yB3/y25vEUZdm1utPMJnSr7Y/S2CSlVDNXU8c+/Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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