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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f743fccc00c72e688e2aa1d25aeca969e6191ca4b7dc07e40f8aa648d5ec48b7' 
  AND token = 'EHXeThdYXQ2VZuMJ4PFIBXQBu+qduJ7DWxXu+XkQ9ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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