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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b938f4de61e96d725012406addd61c477825e860704a08c3d001319d4dfb898c' 
  AND token = '3EpgKaLTW13cjeRPjAYY2nMm2tOV+ruv/rsT5DZgazg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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