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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8674bf752620d500826486df906202d25cf767ad71fdf7ffe78bbac72e6fb23a' 
  AND token = 'y6fUeK0O2sM7vuVFvwhdclvQTlLR1ZX8ceWRperOJ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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