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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b555263bde66a37507a1b5c16950288ae6045b653553907a49fb480eed208bf1' 
  AND token = 'byjKokmO0N6eIk5pZbrRZlXZ4oSZ5bVXYBFoCHjB3PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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