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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08387706647e58c23f97710fafef709d9535e4e2f7d25c5f056a0780d6641ba' 
  AND token = 't4Yr2RR2pn+zZPwXgRnAxl2ZF3Y5xBMm5t2jlcylBRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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