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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacbf9361211fc70161720dda8caaf1b1354cb553dd955ca9068ba728f4b725a' 
  AND token = '8+UArmxUDXaUP3DZ3Mdjrf4W/3HI2idnk3upzO0s35A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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