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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7750a4b24b3e3a5ba933e284580bafdb0145f737b43acadb057f0145ab42d55' 
  AND token = 'oKoLvs5ft9LnmtqL9l9MJLVdNN1KOk2H6mXzF4BckM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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