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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fca5f1aecddbaa4a2a618f7c312d8f945e77a7c6f4d54ede0e1b08a1151e51' 
  AND token = 'd1Pfp5/MH1cHOzOcniEJBWzHFAsafW14Vibny0koaM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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