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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1f24881d6d3c6740e6e389bf467d4da2fdf32030a92df849f80418343e0523' 
  AND token = 'fj1f/zKbmad+DZXBSM2g9dU3bXJX+TpWxW+C9f3EwbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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