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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14634ee65824327775d948ee97778e03c3fb5b9ad1ede9ace0382328f05c9cd' 
  AND token = 'Npov2H5qL9PAGYKoWuQOD4ITLkPlNY8OC+523+NSsWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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