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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdf76a48aeeff3a118171b1bc8715c0be8656a0ee1dff370f19a872fc494839' 
  AND token = 'xPEhhLRB3P34SNWFF4VH4DTg43pxSoHnDz6tIhsytxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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