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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01936a4bcfd904059b1ffd7110bccf86b14ac1db32f7ef4862f04d3595684db2' 
  AND token = 'f6gx2unHQO7B8De3WpFX0cVMnaWFwfR9Be8RPBciP5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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