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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474e91bf5f874f1c96a92e180564b2fb16fa32dfce0da1ddf57bb559fdacb373' 
  AND token = '6hxdMCQncQp1oMBOvTHjbts8Vm4Xex8zOilYzF9OQE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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