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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae51b863a220c3f8d2c9a47f73dea31c043065998a8732efe176a2a8706b6e47' 
  AND token = 'mWYFgjVIvS2c42ODUxDiqAHjwTqtjHP9S7Gde1Y5Geg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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