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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948f21efc64527c3ced8f5d15422a94c352fa6f89590c9149391e47c3e2de61f' 
  AND token = '0OKr0acvTXtV2RYDzltOguh3Srt/5PyuAkUj5q32w/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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