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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f880ea089ecfadf4867d8c9210771cf4ff09c9317f87045bd9de69c9657a15' 
  AND token = '7V573NYVHRfOwiZmLDM1H5e3H27TZX3xtl4vitF96z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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