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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d7bf64abc0dd31cedcb708f3933191b36bad1a120d2e39988a6bf7ddd8a082' 
  AND token = 'kY1zIfYX/jqiOumlr6Ezjy9ZsWYGauFScT3T0Hq9wYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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