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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bef95c8568005970b49e48bf6afc3d77741f433975c2524424eb202aa9acee9' 
  AND token = 'dSmiLg26MatgMfyuFMZ73QOBP+Gis3JQ1qWgn5vi/ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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