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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b6f5da43d48639c14b5c34a2daf69ee9474e948b4607419fcf702babca83f3' 
  AND token = '86cntBiqJmm1noDKiBKtrNZGM86W9N5tl6S1lHq5q8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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