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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7de00705c8dbcac19237bd9bc0ec9614785f678ed1bf952cb193a71d43a7c84' 
  AND token = 'dmmYFEOj/iCxMumVP1bKflRkLHX6iO97fleXXaIuqsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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