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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c74db4fa3d3f94da39a8071368a234ae669f9cccc39700612be10941703cb1' 
  AND token = '14daFWI4WahtOXPGVE5nLgXY9r6B6DqupO/g7axVP7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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