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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1210e40de6aca0be23cb025e925f45210029a856689c16b9e3808a83caa61ab3' 
  AND token = 'GnBkRFhOYI5l2MwPV8eDAPCacwmz/N/zv7paJpboLh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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