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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dbeed89f720e571b2d7c3903020fa3d4373949d29fa44277b7ca6bfbec8fe0' 
  AND token = 'yf9+SYgv4Sp70c4puogLyVe6rUq/cjjSu9lfNWRcsoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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