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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fda4998127d3109a14c4c32154779dc36b1b80eacc24a13f7bdba064c49a3c4' 
  AND token = '5y7Q0QRm4NUZg/ifbIxq9F3ryfi/rnhKxdxaKvza+Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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