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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab81517e7cddefbc6ba0013875a6bc9e0b879fc962e1f72cd4b7972ecd4980a9' 
  AND token = 'NSBhwMoTJbaF4h0EFUP5ARzP0RYq30f9ZiZhDnjHbcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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