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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe922505ba592c35fd06bb3fb2f761d935d6b931d3e3731f7665e7b48a8c4cb' 
  AND token = 'a8Ic8yHsDfWWBb5HO6w7DPKEmWw4Y/Tdm9WGeW93x/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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