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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108be4d7d7da1337a83d117a366e33e2f6e01ca028b617f15cc61a47aeeaf3f0' 
  AND token = '2WfYVW7xxYvQR2URSMtR+cwFDSTUoZu4igUXycWIIhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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