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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f710457a67644e0145653fb294aaa1f13dc4a558f1cdb699106e523f15cc9408' 
  AND token = 'en99xgATPJhga/s8cSXbPWyrbdRzx4edu3Kzzo8R8rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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