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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6336569ddc6ed54e36ab4b4fa809772bbf3e6f53300658ba63eb7d25df23ac7' 
  AND token = 'kIMy8vDwPKXXGy0UPjc8HCZi4kpgLmUekz8Fd0cMmTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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