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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee579cff028172b7d094504f97b145a24b5e66aced0208c8e4d13f19f82d1ae0' 
  AND token = 'c5wdc55SH6V6GG5KaVurTu21kprj6IRx/O1CKdfiuHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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