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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f3cfbfe9c261bb29be66c37285bb701805b5291f40d7bdb93d2190a3c8a326' 
  AND token = 'y1kKiPXA15UTEPsZ/Jy2U8nmJLY7g3ni14eCm59xu8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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