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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ebbfce50c9e0ca21da71d786053af63d21b2767c8ceedcd8a2886939e14fdf' 
  AND token = 'dqrq2ozklIbvIc5J1kD8D99dATNLowcKgejlVha5aMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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