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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3487dfd39d2addcb5b4a24911713646b0e7480864658e299725e4057bd75b7' 
  AND token = 'psJQywxNDMvZWs40iL2xWOAS4+u9Ar1S/Q+SiPraLfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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