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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3f975857c1054188cafb628c459796ff70dd94d0f2bb95dc2232b32d83a813' 
  AND token = 'aXauiook28XIEz3fbICOdhzqTkt3s9HyAkq2zx+47I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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