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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423b69407f72e23a28d57746978297c39be228f1baadeda31d3ebf7a0160cc19' 
  AND token = 'Skxd6/XV5U9B8cCGnVWwSXlkFabRQNepOdeEa2ha9fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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